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Finding the Fourth Proportional to 138,225.68, 190,751.72 and 78,609.68

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Solution

The fourth proportional to 138,225.68, 190,751.72 and 78,609.68 is: 108,481.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,225.68 : 190,751.72 = 78,609.68 : x
  2. Step 2: Convert to fraction form
    138,225.68/190,751.72 = 78,609.68/x
  3. Step 3: Cross multiply
    138,225.68x = 190,751.72 × 78,609.68
  4. Step 4: Simplify right side
    138,225.68x = 14,994,931,668.65
  5. Step 5: Solve for x
    x = 14,994,931,668.65/138,225.68
  6. Step 6: Final answer
    x = 108,481.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.